So I finally finished her off. I also got in two games against some Circle over the weekend using Rahn's new theme force from No Quarter.
All in all I'm very impressed with the colossal. It was able to tank the middle of the board and take a ton of abuse all while dishing out plenty of it's own the entire time. Oddly enough I only got to shoot with it once, but it spent quite a bit of each game in combat punching away.